Sort like like the intense heat that a Swiss sativa has to endure in nature, right?
The strain might easily be a cross that is sativa dominant or even one that is not all that sativa dominant but has more of a sativa appearance to it, as in narrow leaves. He'd still be best to try to maintain normal growing temperatures of mid to upper 70's. Even if it is a true sativa it doesn't need equatorial conditions.
That is likely but not assured, especially if it is a cross. Not that I like the strain, it's just the first to come to mind, but Arjan's Haze #2, which is highly predominantly sativa, has a 67 day flowering time, 9.5 weeks, and that's not much different than many indicas.
HPS is HID (High Intensity Discharge) Did you mean MH, as in Metal Halide? If so that is also HID but he would want MH for flower and HPS for flower.
I didn't see where it was said the 400-watt light that is being waited for is a CFL so I think it is safe to assume he meant a HID light, but I have seen a 500-watt CFL grow light ... but it was sort of a misrepresentation in that it did not have one 500-watt bulb but instead two 250-watt bulbs of different Kelvin rating to give a broader light spectrum .. but it would not penetrate like the wattage would made someone think it would .. and that was the misrepresentation part.